Four in a hundred

Yes, I'm still pissed off about it. Most of the time I'm riding my new bike, so I'm not reminded of it, but when I ride my backup bike, I have two computer mounts to choose from. After my recent exploding tire incident, I found myself on my trusty ol' aluminum steed and couldn't resist the temptation to drive myself nuts. The photo below tells the whole story. The Garmin Edge 25 is shorting me by exactly 4% on miles compared to the Planet Bike computer. I lose exactly one mile in every 25. Thanks NASA.

One of these things is not like the other

Left: Planet Bike Protegé 9.           Right: Garmin Edge 25

I like the nice small form factor of the Garmin, which is just about as small as a bike computer can get. And I like the Garmin web site and all the neat analytical tools it affords. But it just irks me that it seems to measure distance differently than any other bike computer I've ever had. It irks me even more to think that it might be the more accurate and my other computers were inflating my mileage all these years!